Patient entry (informed consent, patient registration, randomization and blinding) An informed consent approved by the Harvard Medical School/Harvard School of Dental Medicine Committee on Human Studies will be obtained for all subjects to be entered in this study. Its conduct will adhere to the principles outlined by the Office for Research Subject Protection of the Harvard Medical School / Harvard School of Dental Medicine. Each subject will be randomly assigned to one of the two treatment options. A random permuted block approach will be used to allocate patients into one of the treatment groups. A sealed envelope containing the treatment group (control or test group) will be assigned to each patient. Subsequently and according to the assigned treatment, a ZCC restoration (test group) or a TCF ceramo-metal (control group) will be fabricated and delivered to the clinician.